Journal
JOURNAL OF APPLIED POLYMER SCIENCE
Volume 86, Issue 13, Pages 3425-3429Publisher
JOHN WILEY & SONS INC
DOI: 10.1002/app.11370
Keywords
nanocomposites; crystal structures; biopolymers; mechanical properties; thin films
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Silk fibroin-microcrystalline cellulose (cellulose whisker) composite films with varied compositions were prepared by casting mixed aqueous solution/suspensions of the two components. Silk fibroin was dissolved in 10M LiSCN followed by dialysis; a cellulose whisker suspension was prepared by sulfuric acid hydrolysis of tunicate cellulose. Macroscopically homogeneous films were obtained at all mixing ratios. While the Young's modulus of the composite films showed a linear, additive dependence on the mixing ratio, the tensile strength and ultimate strain showed a maximum at a 70-80% cellulose content, reaching five times those of fibroin-alone or cellulose-alone films. At the same mixing ratio, infrared spectra of the composite films showed a shift of the amide I peak from 1654 to 1625 cm(-1), indicating the conformational change of fibroin from a random coil to a P structure (silk 11) at the whisker-matrix interface. This change seems to be induced by contact of fibroin molecules with a highly ordered surface of cellulose whisker. (C) 2002 Wiley Periodicals, Inc.
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